#include <stdio.h>

int main(int argc, char *argv[])
{
    enum {a, b, c} num;

    switch (num) {
    case 0:
        printf("a: %d", a);
        break;
    case 1:
        printf("b: %d", b);

    default:
        printf("xxx");

        printf("\n");
    }

    return 0;
}
